first shut off the XP firewall
next enable NetBIOS over tcp
http://www.wown.com/j_helmig/wxpwin9x.htm
and from a great expert lrmoore
First and formost, make sure there is no firewall software running!

You may just be SOL here. In order to properly see XP with 98 you need to run the Network Wizard. This assigns a DHCP server setting while the AIX is probably expecting a static IP. You have a catch 22 here. I suggest storing the stuff that needs to be shared on either a 98 system or on AIX.

first shut off the XP firewall
next enable NetBIOS over tcphttp://www.wown.com/j_helmig/wxpwin9x.htm
and from a great expert lrmoore
First and formost, make sure there is no firewall software running! XP has built in PFW.Turn off the Internet Connection Firewall ICF in the advanced settings for the Lan Connection. Check for Norton Internet Security AV/Firewall, BlackIce, ZoneAlarm, et al.

I have Windows 98 and Windows XP networked through a LinkSys router. I'll describe how I set them up and see if it helps you.

First in Windows XP go to the control panel and select the Network Connections icon. Then in the Network Connections window right click on Local Area Connection and select Properties from the menu. Check to see that NWLink NetBIOS, NWLink IPX/SPX/NetBIOS Compatible Protocol, and Internet Protocol (TCP/IP) are installed.

Then select TCP/IP and click the Properties button. In the TCP/IP properties window click the Advanced... button. In the Advanced TCP/IP Settings window select the WINS tab. Then set to enable NetBIOS over TCP/IP. Then restart the computer.

Then in Windows 98 open the control panel and select the Network icon. In the Network window check to see that IPX/SPX-compatible Protocol, NETBIOS support for IPX/SPX-compatible Protocol, and TCP/IP are installed.

Then select IPX/SPX-compatible Protocol and click the Properties button. In the IPX/SPX-compatible Protocol window select the DNS tab and put a check in the box beside "I want to enable NETBIOS over IPX/SPX. Then restart the computer.

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